Skin pigmentation, sun exposure and vitamin D levels in children of the Avon Longitudinal Study of Parents and Children

Table 4 Pigmentation scores and 25(OH)D levels

Pigmentation scores	25(OH)D (nmol/l)^a	95% CI	p-value	R^2b
Skin colour score	0.6	0.2, 1.0	0.003	0.0015
Tanning score	0.3	0.1, 0.6	0.003	0.0014
Freckling score	0.4	0.1, 0.7	0.01	0.0012

^aMean difference in 25(OH)D levels per unit increase in pigmentation score, adjusted for sex, age at blood draw and principal components.
^bSemipartial correlation coefficient squared, indicates the unique contribution of the genetic score to trait variability.
N = 5649.

ISSN: 1471-2458